De Quincey, T., 'On the Knocking on the Gate in Macbeth' (1885)
Freud, S., "Lady Macbeth", Volume 4 of the Complete Works
Adelman, J., Cannibals, Witches and Divorce (ed. Marjorie Garber, 1987)
Muir, K. and Edwards, P., Aspects of Macbeth (1977)
De Quincey, T., 'On the Knocking on the Gate in Macbeth' (1885)
Freud, S., "Lady Macbeth", Volume 4 of the Complete Works
Adelman, J., Cannibals, Witches and Divorce (ed. Marjorie Garber, 1987)
Muir, K. and Edwards, P., Aspects of Macbeth (1977)